I've run into similar issues like this with Pyramid before, though it was 
usually from trying to leverage the work of previous queries into low-cost 
`.get()` functions onto the identity map.

The trick I settled on is to keep an array as a @reify request property, 
then stash objects onto it.

    def request_setup_persistanceArray(request):
        """stash items in here, so they don't get cleaned up"""
        return []


    def includeme(config):
        config.add_request_method(request_setup_persistanceArray, 
'persistanceArray', reify=True,)

Whenever I query certain objects, I immediately do this:

    `request.persistanceArray.append(obj)`

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The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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